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                            ## 一、概述
js的重要性不言而喻，為了更好的支持前端開發，很多非標注的增強特性，不斷被開發出來，但瀏覽器可能當前并不支持，所以，需要通過一個擴展技術，來進行編譯或轉換。
這里就引入了JavaScript 編譯器技術，將 ECMAScript 2015+ 版本的代碼轉換為向后兼容的 JavaScript 語法；
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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